Examine the DNA sequence below.

TAC CCG ATG AAA GCC

Which represents the complementary strand of DNA?

ATC GGC TAG TTT CGG

would have been the complementary strand if not for the error in the third sequence TAG. The correct sequence should be TAC.

Explanation: In DNA base pairing, Adenine pairs with Thymine and Guanine pairs with Cytosine; A=T, G=C. The two strands of DNA are complementary to each other, this means that the two strands are not the same in base composition and sequence rather wherever adenine is found in one strand, thymine occurs in the other strand and wherever guanine occurs in one strand, cytosine is found in the other strand. Therefore the correct complementary strand to the DNA strand above is ATC GGC TAC TTT CGG.

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